Augmented Th17-type immune responses in preterm neonates exposed to histologic chorioamnionitis

Background:Histologic chorioamnionitis (HCA) is a placental inflammatory disorder that frequently precedes preterm delivery. HCA increases risk for long-standing inflammatory injury and may influence immune programming, particularly in preterm (PT) neonates. We hypothesized that HCA exposure is associated with an increased circulating frequency of proinflammatory, Th17-type responses.Methods:Placental cord blood was collected from HCA-exposed or control neonates (23-41 wk gestation). Frequencies of Th17 and T regulatory (Treg) cells and assessments of Th17-type features in CD4 and Treg cells were determined by flow cytometric analysis.Results:Cord blood samples from 31 PT and 17 term neonates were analyzed by flow cytometry. A diagnosis of HCA in extremely PT (EPT, GA ≤ 30 wk) gestations was associated with the highest cord blood frequencies of progenitor (pTh17, CD4 + CD161 +) and mature (mTh17, CD4 + CD161 + CCR6 +) Th17 cells. Preterm neonates exposed to HCA also exhibited elevated cord blood frequencies of IL-17 + Treg cells, as well as T cells with effector memory phenotype (TEM) that coexpressed Th17-type surface antigens.Conclusion:Th17-type responses are amplified in preterm neonates exposed to HCA. We speculate that a Th17 bias may potentiate the inflammatory responses and related morbidity observed in preterm neonates whose immune systems have been "primed" by HCA exposure.